Splicing type heat preservation and insulation composite board for building outer wall

The utility model discloses a splicing type heat preservation and heat insulation composite board for a building outer wall. The splicing type heat preservation and heat insulation composite board comprises a composite board body, a fixing corner is fixedly connected to the upper portion of the composite board body, a through hole is formed in one end of the fixing corner, a fixing bolt is arranged in the through hole, and one end of the fixing bolt is in threaded connection with a nut. The connecting blocks and the connecting grooves on the two composite boards are in butt joint, after butt joint is completed, the fixing bolts penetrate through the through holes in the two sets of fixing corners, the fixing bolts are tightened through the nuts, when the composite boards are spliced to the edge of a wall, the connecting blocks are inserted into the grooves in the first edge sealing strip, the protruding blocks on the second edge sealing strip are inserted into the connecting grooves, and then the composite bo